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Aluminium Coping: Parapet Wall Weatherproofing for Irish Buildings

Aluminium coping is the weatherproof cap fitted on top of a parapet wall. It protects the wall from rainwater ingress, prevents staining of the wall face below, and provides a clean architectural termination to the building. We manufacture aluminium coping in any width, any RAL colour, with welded joints up to 6m in single pieces, suitable for both secret fix and face fix installation methods.

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What Aluminium Coping Does

A parapet wall is the section of wall that extends above the roof line. Without coping, rainwater enters the top of the wall through the masonry joints, saturates the wall, and eventually causes spalling, frost damage, and internal water ingress. Aluminium coping caps the wall, throwing all rainwater clear of the wall face on both sides. The coping is sloped slightly to one side (typically toward the roof) to direct water away from the public face of the building. Drip lips on both undersides prevent water from tracking back to the wall face.

Secret Fix vs Face Fix Coping

Secret fix coping uses concealed clips fixed to the top of the wall, with the coping snapping or sliding onto the clips. No visible fixings appear on the coping face, giving the cleanest possible architectural finish. This is the preferred specification for high end commercial and residential projects. Face fix coping uses visible fixings (typically powder coated screws) through the coping face into the wall. This is faster to install and lower cost, suited to industrial and utility buildings where appearance is secondary to function.

Standard Coping Profiles

We manufacture three standard coping profiles. The flat top profile has a horizontal top surface with drip lips on both sides, suited to walls where the coping will be visible from above (overlooked by another building or a higher roof). The slope to one side profile has a 5 to 10 degree slope toward the inner face, the most common specification on standalone parapet walls. The double slope (saddle) profile has a central peak with slopes to both sides, used on freestanding parapet walls where water must be shed evenly to both faces.

Welded Joints & Long Spans

We weld coping sections up to 6m in single pieces, eliminating the visual breaks that lapped joints create on traditional coping. For longer spans, welded sections are joined with concealed sleeves and a continuous mastic seal that maintains the visual continuity while accommodating thermal movement. Aluminium coping expands approximately 1mm per metre per 50 degrees C temperature change, so we engineer thermal movement joints at calculated intervals on long spans, typically every 6 to 8m.

Powder Coating & Finish

Standard finish is RAL 7016 anthracite grey satin matt, the most common architectural coping colour in Ireland. Any RAL colour is available with no lead time premium. For coastal locations, specify the hybrid silicone polyester finish at 80 to 120 microns. The 25 year fade and corrosion guarantee applies to all powder coated coping.

Frequently Asked Questions

What thickness aluminium do you use for coping?

2mm standard for residential and most commercial coping. 3mm for long span commercial coping or high wind exposure sites. Some architectural specifications call for 4mm, available on request.

How wide can a coping be?

We fabricate coping to cover walls up to 600mm wide as standard. Wider coping is available on request, the maximum is limited by the available aluminium sheet width (typically 1,000mm).

Do you supply secret fix clips?

Yes. Secret fix clips are stainless steel, supplied with the coping at the rate of one clip every 600mm of length. Fixing screws are not supplied as they are typically site specific (depending on the wall material).

Can coping be welded to follow curved walls?

Yes. We fabricate curved coping to drawing for circular bay parapets, curved roof terminations, and architectural features. Lead time is typically 10 to 14 days for curved fabrication.

How is coping fixed to the wall?

Secret fix uses stainless steel clips screwed to the top of the wall, with the coping snapping onto the clips. Face fix uses powder coated screws through the coping face into rawl plugs in the wall. Mastic seal at all junctions in both cases.

Will the coping rattle in high wind?

No. Properly installed coping with the correct clip spacing does not move under wind load. If you are seeing movement, the clip spacing is too wide or the clips are not properly secured. Standard spec is one clip per 600mm of length.

Can you supply matching corner pieces and end caps?

Yes. External and internal corners are supplied as welded units to match the linear coping. End caps are welded to the coping ends in our workshop, so they arrive finished. Mid wall junctions are detailed with sleeve joints and mastic seal.

What is the typical lead time for aluminium coping?

3 to 5 working days for standard linear coping. 7 to 10 days for projects with multiple welded corners or curved sections. Express lead times are available on request, contact sales.